Rockwell Automation 1440-SPD02-01RB XM-220 Dual Speed Module - Manual (Page 55)

Publication GMSI10-UM004B-EN-P - May 2010
Configuration Parameters 47
Channel Tachometer
Parameters The Tachometer parameters define the characteristics of the tachometer and
determine the signal processing that will be performed on the tachometer
signal. There are two instances of the tachometer parameters, one for each
channel.
TIP
The Channel LED will flash red when a transducer fault
condition exists on the channel even if you are not using
the channel. You can keep the Channel LED from flashing
red on unused channels by setting the unused channel’s
Fault High and Fault Low to greater than zero and less
than zero, respectively. For example, set Fault High to +18
volts and set Fault Low to -18 volts.
IMPORTANT
If you are not using the tachometer channel, set the Pulses
per Revolution to zero. This will disable the tachometer
measurement, and prevent the module from indicating a
tachometer fault.
IMPORTANT
In Single Redundant Channel mode and Reverse Rotation
mode, the Pulses Per Revolution must be non-zero for
both channels. Redundancy or reverse rotation detection
will be impossible if either tachometer is disabled.
IMPORTANT
In Reverse Rotation mode, the value entered in Pulses Per
Revolution must be equal for both channels. And the value
entered in Speed Multiplier must be the equal for both
channels.
Tachometer Parameters
Parameter Name Description Values/Comments
Name (XM Serial Configuration
only) A descriptive name to help identify the tachometer
channel in the XM Serial Configuration Utility. Maximum 18 characters